#app{
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: #3b3b98;
}

.builder{
  width: 400px;
  background-color: rgba(0, 0, 0, .5);
  color: #fff;
  padding: 20px;
}

.builder h2{
  text-align: center;
}

.result{
  position: relative;
  height: 50px;
  background-color: rgba(0, 0, 0, .2);
  margin: 20px 0;
  padding: 0 10px;
  line-height: 50px;
}

.copy {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  right: 10px;
  width: 40px;
  height: 40px;
  background-color: #3b3b98;
  font-size: 14px;
  line-height: 40px;
  text-align: center;
  border-radius: 5px;
  cursor: pointer;
}

.copy:active{
  transform: translateY(-50%) scale(.98);
}

.builder .option {
  display: flex;
  justify-content: space-between;
  margin-bottom: 15px;
  font-size: 18px;
}

.builder .option .length{
  transform: scale(1);
  width: 60px;
  height: 20px;
  border-radius: 2px;
}
.builder .option input{
  transform: scale(1.3);
}

.btn {
  /* width: 80%; */
  height: 40px;
  line-height: 40px;
  text-align: center;
  background-color: #3b3b98;
  margin: 0 auto;
  cursor: pointer;
}

.btn:active{
  transform: scale(.98);
}